DNS returning incorrect information when client uses PPTP from remote locations

Posted on 2008-10-24
Last Modified: 2012-06-21
I have mobile users who are having issues when connecting from home. They can connect to the network however when they attempt to access anything by its friendly name the application or shared drive is unable to connect. For example Outlook can not connect to the exchange server, or remote desktops will not connect to a server, but if I attempt to connect by IP there is no issue. If I open a command prompt and ping a server using its IP I get a correct reply, however if I use the name of the server I get a reply from an IP address that is not for that server. No matter which server I ping I get the same IP address reply If I hibernate the workstation and bring it in to the office and repeat the ping the correct IP is returned. I have taken multiple workstations to a remote location that has the issue and they all return the same IP of I tried this with different builds from know good images that predate the issue to heavily used ones. This is happening at multiple remote locations.  
Question by:knada242
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Expert Comment

ID: 22800189
Sounds like the DNS server information for the internal network isn't being transmitted to the remote clients.  Can you compare the DNS server settings for a VPN client to the settings for a client in the office and see if there are differences?  If you let us know what VPN software/hardware you're using, someone will probably be able to tell you how to add DNS server entries.

Author Comment

ID: 22800232
Hello Scott,

What would be the best way to compare them? I am using the built in remote connection that XP has, and a Watchgaurd firebox.

Expert Comment

ID: 22801099
Open a command prompt and run "ipconfig /all" for the VPN and local connections.

Accepted Solution

knada242 earned 0 total points
ID: 22846167
After doing allot of digging and testing I found that the Provider (Qwest) had implemented a new web helper feature for there internet consumers. When an application requests resources from a server using the host name the ISP would reply with an IP address for this web helper service instead of the actual IP for the server. Check it out the IP address is Apparently it is a new service and there is a way for the client to opt out.

Expert Comment

ID: 23310453

Click the "Can I opt out of the service?" link.

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